tDCS Intervention in Breast Cancer Survivors With and Without Obesity Reporting Cognitive Impairment

Inclusion Criteria: * Female * Over 18 years old * Diagnosed with primary adult-onset breast cancer within the last 5 years * Completed all active cancer treatments at least 3 months prior to study participation * Capable of fulfilling study requirements, including having internet access. * Fluent in either Finnish or English * Have normal or corrected vision and hearing * Right-handed (based on the Edinburgh Handedness Inventory score; Oldfield, 1971) Exclusion Criteria: * Have received primary cancer treatment (chemotherapy, radiotherapy, immunotherapy, or surgery) within the last 3 months * Have a history of childhood-onset cancer * Present with acute eczema on the scalp * Diagnosed with dementia, Alzheimer's disease, multiple sclerosis, or - Parkinson's disease * Have experienced unconsciousness for more than five minutes due to a head/brain injury within the last 10 years * Have a history of stroke or transient ischemic attack * Suffer from claustrophobia * Are pregnant or breastfeeding * Have any of the following medical implants or devices: cardiac implantable electronic devices, metallic intraocular foreign bodies, neurostimulation systems, cochlear/ear implants, drug infusion pumps, catheters with metal components, metallic fragments (e.g., bullets), cerebral aneurysm clips, magnetic dental implants, tissue expanders, artificial limbs, non-removable piercings, or face tattoos. * Weight exceeding 250 kg (the MRI table weight limit) or they are unable to fit within the 70 cm diameter bore of the MRI machine